Channel transmission method, base station, and terminal device

ABSTRACT

The present disclosure relates to channel transmission methods, base stations, and terminal devices. One example method includes receiving a first channel from a network device, determining a frame structure used between the network device and a terminal device according to relationship between a transmission parameter set of the first channel and the frame structure, and communicating with the network device according to the frame structure.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.15/937,399, filed on Mar. 27, 2018, which is a continuation ofInternational Application No. PCT/CN2015/091197, filed on Sep. 30, 2015,the disclosures of which are hereby incorporated by reference in theirentireties.

TECHNICAL FIELD

Embodiments of the present invention relate to the communications field,and in particular, to a channel transmission method, a base station, andterminal device.

BACKGROUND

The Internet of Things (IOT) is a network on which information about aphysical world is obtained by deploying various devices having specificperception, computing, execution, and communication capabilities, andthat is used to implement an interconnection between a person and anobject and between objects by means of information transmission,coordination, and processing. In short, the Internet of Things is usedto implement interworking between a person and an object and betweenobjects. Possible applications of the Internet of Things include variousaspects such as a smart grid, intelligent agriculture, intelligenttransportation, and environment detection.

As a mobile communication standardization organization, the 3rdGeneration Partnership Project (3GPP) is conducting technical researchand standard optimization for Internet of Things services. A mainresearch and optimization direction is to implement cost reduction andcoverage enhancement. In terms of cost reduction, an operating bandwidthof a terminal device can be reduced. For example, limiting an operatingbandwidth of a terminal device to 1.4 MHz (or 200 kHz, or 180 kHz) is animportant research direction. In terms of coverage enhancement, coverageenhancement support is provided mainly for a machine type communication(MTC) device having a relatively large path loss in places such as abasement, so that the device in a special scenario can access a networkto obtain a service. Coverage enhancement means providing coverageenhancement support for terminal device having a relatively large pathloss in places such as a basement and a cell edge, so that the terminaldevice in the foregoing scenarios can access a network to obtain aservice. Coverage enhancement may be implemented in one or more ofrepeated transmission, spread spectrum transmission, retransmission,transmission time interval bundling-based transmission, narrowband (forexample, subcarrier scheduling) transmission, ultra-narrowband (whosebandwidth is, for example, dozens of hertz to more than 10 kilohertz)transmission, power spectrum density boosting-based transmission,requirement relaxed transmission, or continuously attemptedtransmission. Signal repetition is one of methods for implementingcoverage enhancement. When coverage enhancement is implemented, coveragecan be expanded to some extent, but more system resources may beconsumed. Therefore, it is necessary to improve resource utilizationwhen signal repetition is used to implement coverage enhancement.

Communication between a base station and terminal device may beimplemented in one of a plurality of communication modes. For example, aplurality of communication modes are supported in a transmissionbandwidth of a legacy carrier. A communication mode may be understood asan air interface communications technology, a communicationsspecification, a communication deployment scenario, or a communicationsstandard. Different communication modes may be understood as differentair interface communications technologies, different communicationsstandard technologies, or the like. For example, terminal device in aLong Term Evolution (LTE) system or a Long Term Evolution Advanced(LTE-A) system supports an LTE (or LTE-A) communications technology. Abase station can further communicate with another terminal device (forexample, MTC terminal device or IoT terminal device) on an LTE carrierby using another air interface technology different from an LTEcommunication mode.

Therefore, when a base station and terminal device communicate with eachother, communication between the base station and the terminal devicemay be implemented in one of a plurality of communication modes (forexample, one of two, three, or more types of communication modes).However, an existing indication method is applicable only to indicationof a frame structure, information content, and the like, and there is nomethod for indicating a communication mode in the prior art.

SUMMARY

Embodiments of the present invention provide a channel transmissionmethod, a base station, and terminal device, to implement indication ofa communication mode, so that a base station and terminal devicecommunicate with each other in a communication mode indicated by thebase station. This improves flexibility of system design, reducescomplexity of blindly detecting a communication mode by the terminaldevice, and reduces power consumption of the terminal device.

According to a first aspect, an embodiment of the present inventionprovides a channel transmission method, including: determining, by abase station, a communication mode to be used between the base stationand terminal device; determining, by the base station, a transmissionparameter of a first channel according to the determined communicationmode, where the communication mode and the transmission parameter of thefirst channel are in a one-to-one correspondence; and transmitting, bythe base station, the first channel to the terminal device.

With reference to the first aspect, in a first possible implementationof the first aspect, the determining, by the base station, atransmission parameter of a first channel according to the determinedcommunication mode includes:

determining, by the base station, the transmission parameter of thefirst channel and a transmission parameter of a second channel accordingto the determined communication mode, where the communication mode and atransmission parameter set are in a one-to-one correspondence, and thetransmission parameter set includes the transmission parameter of thefirst channel and the transmission parameter of the second channel; and

the transmitting, by the base station, the first channel to the terminaldevice includes:

sending, by the base station, both the first channel and the secondchannel to the terminal device.

With reference to the first aspect or the first possible implementationof the first aspect, in a second possible implementation of the firstaspect, the transmission parameter of the first channel includes atleast one of the following information: a sequence used by the firstchannel, a time resource used for transmitting the first channel, afrequency resource used for transmitting the first channel, a mappingmanner used by the first channel, a spatial coding matrix used by thefirst channel, a scrambling code used for scrambling information in thefirst channel, or information in the first channel; and/or

the transmission parameter of the second channel includes at least oneof the following information: a sequence used by the second channel, atime resource used for transmitting the second channel, a frequencyresource used for transmitting the second channel, a mapping manner usedby the second channel, a spatial coding matrix used by the secondchannel, a scrambling code used for scrambling information in the secondchannel, or information in the second channel.

With reference to the first aspect, or the first or the second possibleimplementation of the first aspect, in a third possible implementationof the first aspect, the first channel includes at least one of thefollowing content: a synchronization channel, a reference signal, abroadcast channel, or a physical channel carrying system information;and/or

the second channel includes at least one of the following content: asynchronization channel, a reference signal, a broadcast channel, or aphysical channel carrying system information.

With reference to the first aspect, in a fourth possible implementationof the first aspect, the determining, by the base station, atransmission parameter of a first channel according to the determinedcommunication mode includes:

determining, by the base station, a transmission parameter of asynchronization channel according to the determined communication mode,where different communication modes are corresponding to differenttransmission parameters of the synchronization channel; or

determining, by the base station, a transmission parameter of areference signal according to the determined communication mode, wheredifferent communication modes are corresponding to a same transmissionparameter of a synchronization channel; or

determining, by the base station, a transmission parameter of abroadcast channel according to the determined communication mode, wheredifferent communication modes are corresponding to a same transmissionparameter of a synchronization channel and/or a same transmissionparameter of a reference signal; or

determining, by the base station according to the determinedcommunication mode, a transmission parameter of a physical channeltransmitted after a broadcast channel is transmitted, where differentcommunication modes are corresponding to at least one of a sametransmission parameter of a synchronization channel, a same transmissionparameter of a reference signal, or a same transmission parameter of thebroadcast channel.

With reference to the first possible implementation of the first aspect,in a fifth possible implementation of the first aspect, the determining,by the base station, the transmission parameter of the first channel anda transmission parameter of a second channel according to the determinedcommunication mode includes:

determining, by the base station, a transmission parameterinterrelationship according to the determined communication mode, wherethe transmission parameter interrelationship is an interrelationshipbetween the transmission parameter of the first channel and thetransmission parameter of the second channel.

With reference to the fifth possible implementation of the first aspect,in a sixth possible implementation of the first aspect, the transmissionparameter interrelationship includes at least one of the followinginformation: a time interval between a time resource used fortransmitting the first channel and a time resource used for transmittingthe second channel, a sequence used by the first channel and a sequenceused by the second channel, a mapping manner used by the first channeland a mapping manner used by the second channel, or a resource used bythe first channel and a resource used by the second channel.

With reference to the first aspect, or the first, the second, the third,the fourth, the fifth, or the sixth possible implementation of the firstaspect, in a seventh possible implementation of the first aspect, thecommunication mode includes at least one of the following modes: anin-band mode, a guardband mode, or an standalone mode.

According to a second aspect, an embodiment of the present inventionfurther provides another channel transmission method, including:

determining, by terminal device, a first channel transmitted by a basestation;

obtaining, by the terminal device, a transmission parameter of the firstchannel from the first channel; and

determining, by the terminal device according to the transmissionparameter of the first channel, a communication mode used between thebase station and the terminal device, where the communication mode andthe transmission parameter of the first channel are in a one-to-onecorrespondence.

With reference to the second aspect, in a first possible implementationof the second aspect, the method further includes:

determining, by the terminal device, a second channel transmitted by thebase station; and

obtaining, by the terminal device, a transmission parameter of thesecond channel from the second channel; and

the determining, by the terminal device according to the transmissionparameter of the first channel, a communication mode used between thebase station and the terminal device includes:

determining, by the terminal device, the communication mode according tothe transmission parameter of the first channel and the transmissionparameter of the second channel, where the communication mode and atransmission parameter set are in a one-to-one correspondence, and thetransmission parameter set includes the transmission parameter of thefirst channel and the transmission parameter of the second channel.

With reference to the second aspect or the first possible implementationof the second aspect, in a second possible implementation of the secondaspect, the transmission parameter of the first channel includes atleast one of the following information: a sequence used by the firstchannel, a time resource used for transmitting the first channel, afrequency resource used for transmitting the first channel, a mappingmanner used by the first channel, a spatial coding matrix used by thefirst channel, a scrambling code used for scrambling information in thefirst channel, or information in the first channel; and/or thetransmission parameter of the second channel includes at least one ofthe following information: a sequence used by the second channel, a timeresource used for transmitting the second channel, a frequency resourceused for transmitting the second channel, a mapping manner used by thesecond channel, a spatial coding matrix used by the second channel, ascrambling code used for scrambling information in the second channel,or information in the second channel.

With reference to the second aspect, or the first or the second possibleimplementation of the second aspect, in a third possible implementationof the second aspect, the first channel includes at least one of thefollowing content: a synchronization channel, a reference signal, abroadcast channel, or a physical channel carrying system information;and/or

the second channel includes at least one of the following content: asynchronization channel, a reference signal, a broadcast channel, or aphysical channel carrying system information.

With reference to the second aspect, in a fourth possible implementationof the second aspect, the method further includes:

when the first channel is a synchronization channel, determining, by theterminal device, that different communication modes are corresponding todifferent transmission parameters of the synchronization channel; or

when the first channel is a reference signal, determining, by theterminal device, that different communication modes are corresponding toa same transmission parameter of a synchronization channel; or

when the first channel is a broadcast channel, determining, by theterminal device, that different communication modes are corresponding toa same transmission parameter of a synchronization channel and/or a sametransmission parameter of the reference signal; or

when the first channel is a physical channel transmitted after abroadcast channel is transmitted, determining, by the terminal device,that different communication modes are corresponding to at least one ofa same transmission parameter of a synchronization channel, a sametransmission parameter of a reference signal, or a same transmissionparameter of the broadcast channel.

With reference to the first possible implementation of the secondaspect, in a fifth possible implementation of the second aspect, thedetermining, by the terminal device, the communication mode according tothe transmission parameter of the first channel and the transmissionparameter of the second channel includes:

determining, by the terminal device, the communication mode according toa transmission parameter interrelationship, where the transmissionparameter interrelationship is an interrelationship between thetransmission parameter of the first channel and the transmissionparameter of the second channel.

With reference to the fifth possible implementation of the secondaspect, in a sixth possible implementation of the second aspect, thetransmission parameter interrelationship includes at least one of thefollowing information: a time interval between a time resource used fortransmitting the first channel and a time resource used for transmittingthe second channel, a sequence used by the first channel and a sequenceused by the second channel, a mapping manner used by the first channeland a mapping manner used by the second channel, or a resource used bythe first channel and a resource used by the second channel.

With reference to the second aspect, or the first, the second, thethird, the fourth, the fifth, or the sixth possible implementation ofthe second aspect, in a seventh possible implementation of the secondaspect, the communication mode includes at least one of the followingmodes: an in-band mode, a guardband mode, or an standalone mode.

According to a third aspect, an embodiment of the present inventionfurther provides a base station, including:

a mode determining module, configured to determine a communication modeto be used between the base station and terminal device:

a parameter determining module, configured to determine a transmissionparameter of a first channel according to the determined communicationmode, where the communication mode and the transmission parameter of thefirst channel are in a one-to-one correspondence; and

a transmission module, configured to transmit the first channel to theterminal device.

With reference to the third aspect, in a first possible implementationof the third aspect, the parameter determining module is specificallyconfigured to determine the transmission parameter of the first channeland a transmission parameter of a second channel according to thedetermined communication mode, where the communication mode and atransmission parameter set are in a one-to-one correspondence, and thetransmission parameter set includes the transmission parameter of thefirst channel and the transmission parameter of the second channel; and

the transmission module is specifically configured to send both thefirst channel and the second channel to the terminal device.

With reference to the third aspect or the first possible implementationof the third aspect, in a second possible implementation of the thirdaspect, the transmission parameter of the first channel includes atleast one of the following information: a sequence used by the firstchannel, a time resource used for transmitting the first channel, afrequency resource used for transmitting the first channel, a mappingmanner used by the first channel, a spatial coding matrix used by thefirst channel, a scrambling code used for scrambling information in thefirst channel, or information in the first channel; and/or

the transmission parameter of the second channel includes at least oneof the following information: a sequence used by the second channel, atime resource used for transmitting the second channel, a frequencyresource used for transmitting the second channel, a mapping manner usedby the second channel, a spatial coding matrix used by the secondchannel, a scrambling code used for scrambling information in the secondchannel, or information in the second channel.

With reference to the third aspect, or the first or the second possibleimplementation of the third aspect, in a third possible implementationof the third aspect, the first channel includes at least one of thefollowing content: a synchronization channel, a reference signal, abroadcast channel, or a physical channel carrying system information;and/or

the second channel includes at least one of the following content: asynchronization channel, a reference signal, a broadcast channel, or aphysical channel carrying system information.

With reference to the third aspect, in a fourth possible implementationof the third aspect, the parameter determining module is specificallyconfigured to: determine a transmission parameter of a synchronizationchannel according to the determined communication mode, where differentcommunication modes are corresponding to different transmissionparameters of the synchronization channel; or determine a transmissionparameter of a reference signal according to the determinedcommunication mode, where different communication modes arecorresponding to a same transmission parameter of a synchronizationchannel; or determine a transmission parameter of a broadcast channelaccording to the determined communication mode, where differentcommunication modes are corresponding to a same transmission parameterof a synchronization channel and/or a same transmission parameter of areference signal; or determine, according to the determinedcommunication mode, a transmission parameter of a physical channeltransmitted after a broadcast channel is transmitted, where differentcommunication modes are corresponding to at least one of a sametransmission parameter of a synchronization channel, a same transmissionparameter of a reference signal, or a same transmission parameter of thebroadcast channel.

With reference to the first possible implementation of the third aspect,in a fifth possible implementation of the third aspect, the parameterdetermining module is specifically configured to determine atransmission parameter interrelationship according to the determinedcommunication mode, where the transmission parameter interrelationshipis an interrelationship between the transmission parameter of the firstchannel and the transmission parameter of the second channel.

With reference to the fifth possible implementation of the third aspect,in a sixth possible implementation of the third aspect, the transmissionparameter interrelationship includes at least one of the followinginformation: a time interval between a time resource used fortransmitting the first channel and a time resource used for transmittingthe second channel, a sequence used by the first channel and a sequenceused by the second channel, a mapping manner used by the first channeland a mapping manner used by the second channel, or a resource used bythe first channel and a resource used by the second channel.

With reference to the third aspect, or the first, the second, the third,the fourth, the fifth, or the sixth possible implementation of the thirdaspect, in a seventh possible implementation of the third aspect, thecommunication mode includes at least one of the following modes: anin-band mode, a guardband mode, or an standalone mode.

According to a fourth aspect, an embodiment of the present inventionfurther provides terminal device, including:

a channel determining module, configured to determine a first channeltransmitted by a base station;

a parameter obtaining module, configured to obtain a transmissionparameter of the first channel from the first channel; and

a mode determining module, configured to determine, according to thetransmission parameter of the first channel, a communication mode usedbetween the base station and the terminal device, where thecommunication mode and the transmission parameter of the first channelare in a one-to-one correspondence.

With reference to the fourth aspect, in a first possible implementationof the fourth aspect, the channel determining module is furtherconfigured to determine a second channel transmitted by the basestation;

the parameter determining module is further configured to obtain atransmission parameter of the second channel from the second channel;and

the mode determining module is specifically configured to determine thecommunication mode according to the transmission parameter of the firstchannel and the transmission parameter of the second channel, where thecommunication mode and a transmission parameter set are in a one-to-onecorrespondence, and the transmission parameter set includes thetransmission parameter of the first channel and the transmissionparameter of the second channel.

With reference to the fourth aspect or the first possible implementationof the fourth aspect, in a second possible implementation of the fourthaspect, the transmission parameter of the first channel includes atleast one of the following information: a sequence used by the firstchannel, a time resource used for transmitting the first channel, afrequency resource used for transmitting the first channel, a mappingmanner used by the first channel, a spatial coding matrix used by thefirst channel, a scrambling code used for scrambling information in thefirst channel, or information in the first channel; and/or

the transmission parameter of the second channel includes at least oneof the following information: a sequence used by the second channel, atime resource used for transmitting the second channel, a frequencyresource used for transmitting the second channel, a mapping manner usedby the second channel, a spatial coding matrix used by the secondchannel, a scrambling code used for scrambling information in the secondchannel, or information in the second channel.

With reference to the fourth aspect, or the first or the second possibleimplementation of the fourth aspect, in a third possible implementationof the fourth aspect, the first channel includes at least one of thefollowing content: a synchronization channel, a reference signal, abroadcast channel, or a physical channel carrying system information;and/or

the second channel includes at least one of the following content: asynchronization channel, a reference signal, a broadcast channel, or aphysical channel carrying system information.

With reference to the fourth aspect, in a fourth possible implementationof the fourth aspect, the parameter determining module is furtherconfigured to: when the first channel is a synchronization channel,determine that different communication modes are corresponding todifferent transmission parameters of the synchronization channel; orwhen the first channel is a reference signal, determine that differentcommunication modes are corresponding to a same transmission parameterof a synchronization channel; or when the first channel is a broadcastchannel, determine that different communication modes are correspondingto a same transmission parameter of a synchronization channel and/or asame transmission parameter of the reference signal; or when the firstchannel is a physical channel transmitted after a broadcast channel istransmitted, determine that different communication modes arecorresponding to at least one of a same transmission parameter of asynchronization channel, a same transmission parameter of a referencesignal, or a same transmission parameter of the broadcast channel.

With reference to the first possible implementation of the fourthaspect, in a fifth possible implementation of the fourth aspect, themode determining module is specifically configured to determine thecommunication mode according to a transmission parameterinterrelationship, where the transmission parameter interrelationship isan interrelationship between the transmission parameter of the firstchannel and the transmission parameter of the second channel.

With reference to the fifth possible implementation of the fourthaspect, in a sixth possible implementation of the fourth aspect, thetransmission parameter interrelationship includes at least one of thefollowing information: a time interval between a time resource used fortransmitting the first channel and a time resource used for transmittingthe second channel, a sequence used by the first channel and a sequenceused by the second channel, a mapping manner used by the first channeland a mapping manner used by the second channel, or a resource used bythe first channel and a resource used by the second channel.

With reference to the fourth aspect, or the first, the second, thethird, the fourth, the fifth, or the sixth possible implementation ofthe fourth aspect, in a seventh possible implementation of the fourthaspect, the communication mode includes at least one of the followingmodes: an in-band mode, a guardband mode, or an standalone mode.

It can be learned from the foregoing technical solutions that theembodiments of the present invention have the following advantages:

In some embodiments of the present disclosure: the base station firstdetermines the communication mode to be used between the base stationand the terminal device; after the base station determines thecommunication mode that should be used, the base station determines thetransmission parameter of the first channel according to the determinedcommunication mode; finally, the base station transmits the firstchannel to the terminal device. Because the base station can determinethe transmission parameter of the first channel according to theone-to-one correspondence between the communication mode and thetransmission parameter of the first channel, the first channeltransmitted by the base station to the terminal device can indicate thecommunication mode used by the base station, so as to implementindication of the communication mode. In addition, after the terminaldevice determines the first channel sent by the base station to theterminal device, the terminal device can determine the transmissionparameter of the first channel from the received first channel, and theterminal device can determine, according to the one-to-onecorrespondence between the communication mode and the transmissionparameter of the first channel, the communication mode used by the basestation. In this way, the communication mode used between the basestation and the terminal device can be uniquely determined. According tothe channel transmission method provided in the embodiments of thepresent invention, determining a communication mode by terminal deviceand indicating the communication mode by a base station can beimplemented. Therefore, the base station and the terminal devicecommunicate with each other in the communication mode indicated by thebase station. This improves flexibility of system design, reducescomplexity of blindly detecting a communication mode by the terminaldevice, and reduces power consumption of the terminal device.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a system architecture diagram of a communications system towhich a channel transmission method in the present invention is applied;

FIG. 2 is a schematic block flowchart of a channel transmission methodaccording to an embodiment of the present invention:

FIG. 3-a is a schematic diagram of transmission performed between a basestation and terminal device in an in-band mode or a sharing modeaccording to an embodiment of the present invention;

FIG. 3-b is a schematic diagram of transmission performed between a basestation and terminal device in a guardband mode according to anembodiment of the present invention;

FIG. 3-c is a schematic diagram of transmission performed between a basestation and terminal device in an standalone mode according to anembodiment of the present invention:

FIG. 4 is a schematic block flowchart of another channel transmissionmethod according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of composition of a basestation according to an embodiment of the present invention:

FIG. 6 is a schematic structural diagram of composition of terminaldevice according to an embodiment of the present invention:

FIG. 7 is a schematic structural diagram of composition of another basestation according to an embodiment of the present invention; and

FIG. 8 is a schematic structural diagram of composition of anotherterminal device according to an embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS

The embodiments of the present invention provide a channel transmissionmethod, a base station, and terminal device, to implement indication ofa communication mode, so that a base station and terminal devicecommunicate with each other in a communication mode indicated by thebase station. This improves flexibility of system design, reducescomplexity of blindly detecting a communication mode by the terminaldevice, and reduces power consumption of the terminal device.

In the specification, claims, and accompanying drawings of the presentinvention, the terms “first”, “second”, and so on are intended todistinguish between similar objects but do not necessarily indicate aparticular order or sequence. It should be understood that the termsused in such a way are interchangeable in proper circumstances, and thisis merely a discrimination manner used when objects having a sameattribute are described in the embodiments of the present invention. Inaddition, the terms “including”, “comprising”, and any other variantsmean to cover a non-exclusive inclusion, so that a process, method,system, product, or device that includes a series of units is notnecessarily limited to those units, but may include other units notexpressly listed or inherent to such a process, method, product, ordevice.

A system architecture to which a channel transmission method in thepresent invention is applied is first described. The present inventionis mainly applied to an LTE system or a Long Term Evolution Advanced(LTE-A) system. The present invention may also be applied to anothercommunications system, such as a Wideband Code Division Multiple Access(WCDMA) system or a Time Division-Synchronous Code Division MultipleAccess (TD-SCDMA) system, provided that an entity that can sendinformation exists in the communications system and another entity thatcan receive information exists in the communications system.

Transmission in the embodiments of the present invention may be sendingor receiving. If transmission by a device on one side is sending,transmission by a communications device on the other side correspondingto the device on the side is receiving, and vice versa. Coverageenhancement in the embodiments of the present invention may beimplemented in one or more of repeated transmission, spread spectrumtransmission, retransmission, transmission time interval bundling-basedtransmission, narrowband (for example, subcarrier scheduling)transmission, ultra-narrowband (whose bandwidth is, for example, dozensof hertz to more than 10 kilohertz) transmission, power spectrum densityboosting-based transmission, requirement relaxed transmission, orcontinuously attempted transmission. A low-cost terminal or alow-complexity terminal means that an operating bandwidth of a terminaldevice is less than an operating bandwidth of a non-low-cost terminal ora non-low-complexity terminal. The operating bandwidth may be one ormore of a processing bandwidth, a radio frequency processing bandwidth,or a baseband processing bandwidth. For example, the operating bandwidthis 1.4 MHz (or 200 kHz, or 180 kHz). The operating bandwidth is afrequency resource having a specific frequency width. The operatingbandwidth may include one or more subcarriers (for example, a size of asubcarrier is 15 kHz, or 2.5 kHz. or 3.75 kHz), or may include one ormore resource blocks.

Referring to FIG. 1, FIG. 1 is a system architecture diagram of acommunications system to which a channel transmission method in thepresent invention is applied. As shown in FIG. 1, a base station(English: Base station) and terminal device (for example UE, UserEquipment) 1 to UE 6 form a communications system. In the communicationssystem, the base station sends one or more of system information, an RARmessage, or a paging message to one or more of the UE 1 to the UE 6. Thebase station is a transmit end device in the channel transmission methodin the present invention. The UE 1 to the UE 6 are receive end devicesin the channel transmission method in the present invention. Inaddition, the UE 4 to the UE 6 also form a communications system. In thecommunications system, the UE 5 may function as a base station. The UE 5may send one or more of system information, an RAR message, or a pagingmessage to one or more of the UE 4 or the UE 6.

The following separately provides descriptions in detail.

An embodiment of a channel transmission method in the present inventionmay be applied to a scenario in which a base station sends a channel toterminal device. Referring to FIG. 2, the channel transmission methodmay include the following steps.

201. A base station determines a communication mode to be used betweenthe base station and terminal device.

In this embodiment of the present invention, the base station and theterminal device may communicate with each other in a plurality ofdifferent communication modes. For example, a plurality of communicationmodes are supported in a transmission bandwidth of a legacy (English:legacy) carrier. A communication mode may be understood as an airinterface communications technology, a communications specification, acommunication deployment scenario, or a communications standard.Different communication modes are different air interface communicationstechnologies, different communications standard technologies, or thelike. Different communication modes may be corresponding to differentchannel structures, signal structures, frame structures, channeltransmission methods, information content, or the like. Therefore, afterthe base station determines a communication mode that should be used,both the base station and the terminal device need to configure,according to the communication mode determined to be used, one or moreof a channel structure, a signal structure, a frame structure, anchannel transmission method, or information content.

In an example, a plurality of communication modes may be configuredbetween the base station and the terminal device. For example, there area total of three communication modes between the base station and theterminal device, and the three communication modes are a communicationmode a, a communication mode b, and a communication mode c. The basestation first determines a communication mode that should be usedbetween the base station and the terminal device. For example, the basestation determines to use the communication mode b.

It should be noted that, in this embodiment of the present invention,the base station determines one communication mode to be used betweenthe base station and the terminal device, or the base station determinestwo communication modes to be used between the base station and theterminal device. For example, that a base station determines acommunication mode to be used between the base station and terminaldevice in step 201 includes the following step: The base stationdetermines a first communication mode to be used by the base station andthe terminal device in a first period and a second communication mode tobe used in a second period, that is, the communication mode determinedby the base station is a plurality of communication modes to be usedbetween the base station and the terminal device in different periods.Therefore, the communication mode determined by the base station in thisembodiment of the present invention may be a plurality of communicationmodes that can be determined in one determining process. For thecommunication mode determined by the base station in step 101 in thisembodiment of the present invention, a communication mode type and aquantity of determined communication modes may be specificallydetermined according to an application scenario. This is not limited.

In some embodiments of the present invention, the communication modeincludes at least one of the following modes: an in-band mode, aguardband mode, or an standalone mode. In a transmission bandwidth of alegacy carrier, not only a legacy mode (for example, for an LTE system,a legacy mode is an LTE air interface standard) but also anothercommunication mode used for another terminal device are supported, andthe another communication mode used for another terminal device isreferred to as an in-band (English: in-band) mode for short, and thein-band mode may also be referred to as a sharing mode. As shown in FIG.3-a, FIG. 3-a is a schematic diagram of transmission performed between abase station and terminal device in an in-band mode or a sharing modeaccording to an embodiment of the present invention. A firstcommunication mode is a legacy mode, and a second communication mode isan in-band mode or a sharing mode. The in-band mode or the sharing modeis used on a resource block in a transmission bandwidth, and the legacymode is used on remaining resource blocks. The base station determines,according to a transmission requirement of the base station, the firstcommunication mode or the second communication mode that needs to beused. This is not specifically limited herein.

For another example, in another communication mode, anothercommunication mode is supported in a guard bandwidth of a legacycarrier. For example, a first communication mode is used in atransmission bandwidth of the legacy carrier, and a second communicationmode is used in the guard bandwidth of the legacy carrier (generally, inthe first communication mode, this part of bandwidth is not used totransmit data, another signal, or the like). For convenience, a mode inwhich the second communication mode is used in the guard bandwidth ofthe legacy carrier for communication is referred to as a guardband modefor short. As shown in FIG. 3-b, FIG. 3-b is a schematic diagram oftransmission performed between a base station and terminal device in aguardband mode according to an embodiment of the present invention. Afirst communication mode is a legacy mode, and a second communicationmode is a guardband mode. The guardband mode is used on a resource blockin a transmission bandwidth, and the legacy mode is used on remainingresource blocks. The base station determines, according to atransmission requirement of the base station, the first communicationmode or the second communication mode that needs to be used. This is notspecifically limited herein.

For another example, in another communication mode, a firstcommunication mode is supported on a legacy carrier, and a secondcommunication mode is supported on another frequency resource (that is,on a frequency resource of a non-legacy carrier). For convenience, amode in which the second communication mode is used on the anotherfrequency resource (that is, on the frequency resource of the non-legacycarrier) for communication is referred to as an standalone mode forshort. As shown in FIG. 3-c, FIG. 3-c is a schematic diagram oftransmission performed between a base station and terminal device in anstandalone mode according to an embodiment of the present invention. Afirst communication mode is a legacy mode, and a second communicationmode is an standalone mode. The base station determines, according to atransmission requirement of the base station, the first communicationmode or the second communication mode that needs to be used. This is notspecifically limited herein.

It should be noted that, in some other embodiments of the presentinvention, the communication mode may include a plurality of differenttypes of modes and may be specifically set flexibly according to anapplication scenario. For example, an in-band mode or a sharing mode,and a guardband mode in the communication mode may alternatively beclassified as a first type of mode, and an standalone mode in thecommunication mode may be classified as a second type of mode. The firsttype of mode may be referred to as an in-band mode, and the second typeof mode may be referred to as an outband (English: outband) mode. Inaddition, the first type of mode may be referred to as a continuousmode, and the second type of mode may be referred to as a discontinuousmode. It can be understood that, implementation of defining theplurality of types of modes included in the communication mode does notaffect specific implementation of the communication mode, between thebase station and the terminal device, determined by the base station inthis embodiment of the present invention.

202. The base station determines a transmission parameter of a firstchannel according to the determined communication mode, where thecommunication mode and the transmission parameter of the first channelare in a one-to-one correspondence.

In this embodiment of the present invention, after the base stationdetermines the communication mode to be used between the base stationand the terminal device in step 201, the transmission parameter of thefirst channel may be determined on the base station side according tothe one-to-one correspondence between the communication mode and thetransmission parameter of the first channel. Different communicationmodes are corresponding to different transmission parameters of thefirst channel. The one-to-one correspondence between the communicationmode and the transmission parameter of the first channel may bepre-defined by a system, or may be determined by the base station andnotified by the base station to the terminal device. After the basestation determines the communication mode to be used between the basestation and the terminal device, the base station determines, accordingto the correspondence and the communication mode determined by the basestation, the transmission parameter corresponding to the communicationmode. After determining the transmission parameter of the first channel,the base station transmits the first channel according to thetransmission parameter. In an example, a plurality of communicationmodes may be configured between the base station and the terminaldevice. For example, there are a total of three communication modesbetween the base station and the terminal device, and the threecommunication modes are a communication mode a, a communication mode b,and a communication mode c, and are corresponding to differenttransmission parameters of the first channel. It is assumed that thecommunication mode and the transmission parameter of the first channelthat are configured on the base station side are in the followingone-to-one correspondence: The communication mode a is uniquelycorresponding to a transmission parameter x, the communication mode b isuniquely corresponding to a transmission parameter y, and thecommunication mode c is uniquely corresponding to a transmissionparameter z. The base station first determines a communication mode thatshould be used between the base station and the terminal device. Forexample, the base station determines to use the communication mode b,and then, the base station determines, according to the one-to-onecorrespondence and the communication mode b, that the transmissionparameter of the first channel is the transmission parameter y.

In some embodiments of the present invention, that the base stationdetermines a transmission parameter of a first channel according to thedetermined communication mode in step 202 may specifically include oneof the following steps:

A1. The base station determines a transmission parameter of asynchronization channel according to the determined communication mode,where different communication modes are corresponding to differenttransmission parameters of the synchronization channel.

A2. The base station determines a transmission parameter of a referencesignal according to the determined communication mode, where differentcommunication modes are corresponding to a same transmission parameterof a synchronization channel.

A3. The base station determines a transmission parameter of a broadcastchannel according to the determined communication mode, where differentcommunication modes are corresponding to a same transmission parameterof a synchronization channel and/or a same transmission parameter of areference signal.

A4. The base station determines, according to the determinedcommunication mode, a transmission parameter of a physical channeltransmitted after a broadcast channel is transmitted, where differentcommunication modes are corresponding to at least one of a sametransmission parameter of a synchronization channel, a same transmissionparameter of a reference signal, or a same transmission parameter of thebroadcast channel.

For example, the base station transmits various channels to the terminaldevice in the following sequence: a synchronization channel, a referencesignal, a broadcast channel, and a physical channel carrying systeminformation. Therefore, in the implementation of step A1, the firstchannel is a synchronization channel, that is, the base station needs toindicate, by using a transmission parameter of the synchronizationchannel, a communication mode to be used between the base station andthe terminal device. In this case, different communication modes arecorresponding to different transmission parameters of thesynchronization channel, and the communication mode and the transmissionparameter of the synchronization channel are in a one-to-onecorrespondence.

In the implementation of step A2, the first channel is a referencesignal, that is, the base station needs to indicate, by using atransmission parameter of the reference signal, a communication mode tobe used between the base station and the terminal device. In this case,different communication modes are corresponding to differenttransmission parameters of the reference signal, and the communicationmode and the transmission parameter of the reference signal are in aone-to-one correspondence. In this case, a same synchronization channelmay be transmitted before the reference signal is transmitted,regardless of a communication mode used by the base station, so as toreduce complexity caused when different synchronization channels need tobe transmitted because the base station and the terminal device usedifferent communication modes. Therefore, if the base station indicatesthe communication mode by using the transmission parameter of thereference signal, the same synchronization channel may be transmittedbefore the reference signal is transmitted.

In the implementation of step A3, the first channel is a broadcastchannel, that is, the base station needs to indicate, by using atransmission parameter of the broadcast channel, a communication mode tobe used between the base station and the terminal device. In this case,different communication modes are corresponding to differenttransmission parameters of the broadcast channel, and the communicationmode and the transmission parameter of the broadcast channel are in aone-to-one correspondence. In this case, a same synchronization channeland/or reference signal may be transmitted before the broadcast channelis transmitted, regardless of a communication mode used by the basestation, so as to reduce complexity caused when differentsynchronization channels and reference signals need to be transmittedbecause the base station and the terminal device use differentcommunication modes. Therefore, if the base station indicates thecommunication mode by using the transmission parameter of the broadcastchannel, the same synchronization channel and/or reference signal may betransmitted before the broadcast channel is transmitted.

In the implementation of step A4, the first channel is a physicalchannel transmitted after a broadcast channel is transmitted, that is,the base station needs to indicate, by using a transmission parameter ofthe physical channel, a communication mode to be used between the basestation and the terminal device. In this case, different communicationmodes are corresponding to different transmission parameters of thephysical channel, and the communication mode and the transmissionparameter of the physical channel are in a one-to-one correspondence.For example, the physical channel is a downlink shared channel forcarrying system information, or the physical channel is an uplinkcontrol channel for scheduling system information. In this case, a samesynchronization channel and/or reference signal and/or broadcast channelmay be transmitted before the physical channel is transmitted,regardless of a communication mode used by the base station, so as toreduce complexity caused when different synchronization channels,reference signals, and broadcast channels need to be transmitted becausethe base station and the terminal device use different communicationmodes. Therefore, if the base station indicates the communication modeby using the transmission parameter of the physical channel, the samesynchronization channel and/or reference signal and/or the broadcastchannel may be transmitted before the physical channel is transmitted.

It should be noted that, in this embodiment of the present invention,the base station determines to indicate, by using the transmissionparameter of the first channel, the communication mode used by the basestation in step 202, and once the base station determines thecommunication mode to be used between the base station and the terminaldevice, the base station can determine a specific transmission parameterthat should be configured for the first channel. In addition, in someother embodiments of the present invention, the base station may use atransmission parameter of a second channel in addition to thetransmission parameter of the first channel, that is, the base stationneeds to indicate, by using both the transmission parameter of the firstchannel and the transmission parameter of the second channel, thecommunication mode used by the base station. Specifically, in someembodiments of the present invention, that the base station determines atransmission parameter of a first channel according to the determinedcommunication mode in step 201 includes the following step:

B1. The base station determines the transmission parameter of the firstchannel and a transmission parameter of a second channel according tothe determined communication mode, where the communication mode and atransmission parameter set are in a one-to-one correspondence, and thetransmission parameter set includes the transmission parameter of thefirst channel and the transmission parameter of the second channel.

After the base station determines the communication mode to be usedbetween the base station and the terminal device in step 201, the basestation determines the transmission parameter set according to theone-to-one correspondence between the communication mode and thetransmission parameter set. Different communication modes arecorresponding to different transmission parameter sets. The transmissionparameter set includes the transmission parameter of the first channeland the transmission parameter of the second channel. After the basestation determines the communication mode to be used between the basestation and the terminal device, the base station determines, accordingto the correspondence and the communication mode determined by the basestation, the transmission parameter set corresponding to thecommunication mode. After determining the transmission parameter set,the base station completes configuration of the transmission parameterof the first channel and the transmission parameter of the secondchannel according to the transmission parameter set.

In an example, a plurality of communication modes may be configuredbetween the base station and the terminal device. For example, there area total of three communication modes between the base station and theterminal device, and the three communication modes are a communicationmode a, a communication mode b, and a communication mode c. It isassumed that the communication mode and the transmission parameter setthat are configured on the base station side are in the followingone-to-one correspondence: The communication mode a is uniquelycorresponding to a transmission parameter set x, the communication modeb is uniquely corresponding to a transmission parameter set y, and thecommunication mode c is uniquely corresponding to a transmissionparameter set z. The transmission parameter set x includes atransmission parameter x1 of the first channel and a transmissionparameter x2 of the second channel. The transmission parameter set yincludes a transmission parameter y of the first channel and atransmission parameter y2 of the second channel. The transmissionparameter set z includes a transmission parameter z1 of the firstchannel and a transmission parameter z2 of the second channel. The basestation first determines a communication mode that should be usedbetween the base station and the terminal device. For example, the basestation determines to use the communication mode b, and then, the basestation determines the transmission parameter set y according to theone-to-one correspondence and the communication mode b. The base stationdetermines that the transmission parameter of the first channel is thetransmission parameter y1, and the base station determines that thetransmission parameter of the second channel is the transmissionparameter y2.

It should be noted that, in this embodiment of the present invention,the first channel is a channel determined by the base station and usedto indicate a communication mode. The first channel may be a channel ofa known channel type, or may be a channel configured between the basestation and the terminal device. A specific implementation of the firstchannel may depend on an application scenario. In addition, the secondchannel is a channel determined by the base station and used to indicatea communication mode. The second channel may be a channel of a knownchannel type, or may be a channel configured between the base stationand the terminal device. A specific implementation of the second channelmay depend on an application scenario. In an example, the first channelincludes at least one of the following content: a synchronizationchannel, a reference signal, a broadcast channel, or a physical channelcarrying system information; and/or the second channel includes at leastone of the following content: a synchronization channel, a referencesignal, a broadcast channel, or a physical channel carrying systeminformation. For example, the first channel may be a synchronizationchannel, a reference signal, a broadcast channel, or a physical channelcarrying system information, and the second channel may be asynchronization channel, a reference signal, a broadcast channel, or aphysical channel carrying system information. For example, then both thefirst channel and the second channel represent a synchronizationchannel, the first channel may be specifically a primary synchronizationchannel, and the second channel may be specifically a secondarysynchronization channel.

In an example, the first channel may be a synchronization channel, andthe second channel may be a broadcast channel. Alternatively, the firstchannel may be a synchronization channel, and the second channel may bea physical channel carrying system information. Alternatively, the firstchannel may be a synchronization channel, and the second channel may bea reference signal. Alternatively, the first channel may be a referencesignal, and the second channel may be a broadcast channel.Alternatively, the first channel may be a broadcast channel, and thesecond channel may be a physical channel carrying system information.

In some embodiments of the present invention, the transmission parameterof the first channel includes at least one of the following information:a sequence used by the first channel, a time resource used fortransmitting the first channel, a frequency resource used fortransmitting the first channel, a mapping manner used by the firstchannel, a spatial coding matrix used by the first channel, a scramblingcode used for scrambling information in the first channel, orinformation in the first channel; and/or the transmission parameter ofthe second channel includes at least one of the following information: asequence used by the second channel, a time resource used fortransmitting the second channel, a frequency resource used fortransmitting the second channel, a mapping manner used by the secondchannel, a spatial coding matrix used by the second channel, ascrambling code used for scrambling information in the second channel,or information in the second channel. The information in the firstchannel is information carried in the first channel, or a field or aninformation element carried in the first channel. The information in thesecond channel is information carried in the second channel, or a fieldor an information element carried in the second channel.

The transmission parameter of the first channel and/or the transmissionparameter of the second channel may be implemented in a plurality ofdifferent manners, provided that these transmission parameters can beuniquely determined according to the communication mode determined bythe base station and used between the base station and the terminaldevice. After the terminal device obtains the transmission parameter ofthe first channel and/or the transmission parameter of the secondchannel from the base station, the terminal device may uniquelydetermine, according to these transmission parameters, a communicationmode that should be used and that is indicated by the base station tothe terminal device.

In a specific implementation, the transmission parameter of the firstchannel is used as an example. There may be a unique correspondencebetween the sequence used by the first channel and the communicationmode, and each of different sequences used by the first channel isuniquely corresponding to a communication mode. There may be a uniquecorrespondence between the time resource used by the first channel andthe communication mode, and each of different time resources used by thefirst channel is uniquely corresponding to a communication mode. Theremay be a unique correspondence between the frequency resource used bythe first channel and the communication mode, and each of differentfrequency resources used by the first channel is uniquely correspondingto a communication mode. There may be a unique correspondence betweenthe mapping manner used by the first channel and the communication mode,and each of different mapping manners used by the first channel isuniquely corresponding to a communication mode. There may be a uniquecorrespondence between the spatial coding matrix used by the firstchannel and the communication mode, and each of different spatial codingmatrices used by the first channel is uniquely corresponding to acommunication mode. There may be a unique correspondence between thescrambling code used for scrambling the information in the first channeland the communication mode, and each of different scrambling codes usedfor scrambling information in the first channel is uniquelycorresponding to a communication mode. There may be a uniquecorrespondence between the information in the first channel and thecommunication mode, and each piece of different information in the firstchannel is uniquely corresponding to a communication mode. It should benoted that, in the foregoing embodiment, the information in the firstchannel may be information carried in the first channel or bit contentcarried in the first channel. In specific implementation, alternatively,the information in the first channel may specifically representdifferent information when channel types represented by the firstchannel are different. In addition, the information in the first channelmay be a plurality of types of information in the first channel. Forexample, when the first channel is a broadcast channel, the informationin the first channel may be a cyclic redundancy check bit, or may be aninformation bit carried in the broadcast channel.

In an example, the first channel is a synchronization channel, and thesynchronization channel does not include a secondary synchronizationchannel. That is, the synchronization channel includes only a primarysynchronization channel. For example, the primary synchronizationchannel indicates communication modes by using different sequences. Forexample, the primary synchronization channel indicates, by using asequence a, that a first communication mode is used between the basestation and the terminal device. The primary synchronization channelindicates, by using a sequence b, that a second communication mode isused between the base station and the terminal device. For anotherexample, the primary synchronization channel indicates communicationmodes in different mapping manners. For example, the primarysynchronization channel indicates, in a first mapping manner, that afirst communication mode is used between the base station and theterminal device. The primary synchronization channel indicates, in asecond mapping manner, that a second communication mode is used betweenthe base station and the terminal device. For another example, theprimary synchronization channel indicates communication modes by usingdifferent resources. For example, the primary synchronization channelindicates, by using a first frequency resource, that a firstcommunication mode is used between the base station and the terminaldevice. The primary synchronization channel indicates, by using a secondfrequency resource, that a second communication mode is used between thebase station and the terminal device.

For another example, the first channel is a reference signal, or abroadcast channel, or a physical channel carrying system information. Inthis embodiment of the present invention, a communication mode may beindicated by scrambling a cyclic redundancy check bit in the broadcastchannel. In this embodiment of the present invention, a communicationmode may be indicated by scrambling an information bit in the broadcastchannel. More specifically, determining a communication mode accordingto a change in the transmission parameter of the first channel is thesame as that described when the first channel is a synchronizationchannel, and is not repeated herein any further.

It should be noted that, in the foregoing example, the transmissionparameter of the first channel is used as an example for description. Animplementation of the transmission parameter of the second channel issimilar to that of the transmission parameter of the first channel, andis not repeated herein any further.

Further, in some embodiments of the present invention, that the basestation determines the transmission parameter of the first channel and atransmission parameter of a second channel according to the determinedcommunication mode in step B1 may specifically include the followingstep;

B11. The base station determines a transmission parameterinterrelationship according to the determined communication mode, wherethe transmission parameter interrelationship is an interrelationshipbetween the transmission parameter of the first channel and thetransmission parameter of the second channel.

In some embodiments of the present invention, that the base stationdetermines the transmission parameter of the first channel and atransmission parameter of a second channel according to the determinedcommunication mode may be specifically determining the transmissionparameter interrelationship, that is, the base station determines thetransmission parameter interrelationship according to the determinedcommunication mode, so as to indicate, according to the transmissionparameter interrelationship, the communication mode determined by thebase station. The communication mode determined by the base station andthe transmission parameter interrelationship are in a one-to-onecorrespondence, that is, different transmission parameterinterrelationships are corresponding to different communication modes.The interrelationship is a relationship between the transmissionparameter of the first channel and the transmission parameter of thesecond channel. After the terminal device obtains the transmissionparameter of the first channel and the transmission parameter of thesecond channel from the base station, the terminal device determines,based on the interrelationship between the transmission parameter of thefirst channel and the transmission parameter of the second channel, thecommunication mode indicated by the base station to the terminal device.

In some embodiments of the present invention, the transmission parameterinterrelationship includes at least one of the following information: atime interval between a time resource used for transmitting the firstchannel and a time resource used for transmitting the second channel, asequence used by the first channel and a sequence used by the secondchannel, a mapping manner used by the first channel and a mapping mannerused by the second channel, or a resource used by the first channel anda resource used by the second channel.

The resource used by the first channel may be specifically one or moreof a time resource, a frequency resource, a power resource, a spaceresource, a code resource, or a scrambling code. The resource used bythe second channel may be specifically one or more of a time resource, afrequency resource, a power resource, a space resource, a code resource,or a scrambling code.

In an example, if a synchronization channel includes a firstsynchronization channel (for example, a primary synchronization channel)and a second synchronization channel (for example, a secondarysynchronization channel), the first channel may be the firstsynchronization channel, and the second channel may be the secondsynchronization channel. The communication mode may be determinedaccording to an interrelationship between the first synchronizationchannel and the second synchronization channel. For example, theinterrelationship between the first synchronization channel and thesecond synchronization channel is a time interval between the firstsynchronization channel and the second synchronization channel. When thetime interval between the first synchronization channel and the secondsynchronization channel is a first time interval, it indicates that afirst communication mode is used between the base station and theterminal device. When the time interval between the firstsynchronization channel and the second synchronization channel is asecond time interval, it indicates that a second communication mode isused between the base station and the terminal device. Further, when thetime interval between the first synchronization channel and the secondsynchronization channel is a third time interval, it indicates that athird communication mode is used between the base station and theterminal device; or the like.

For another example, the interrelationship between the firstsynchronization channel and the second synchronization channel indicatesa sequence used by the first synchronization channel and a sequence usedby the second synchronization channel. When the first synchronizationchannel uses a sequence a and the second synchronization channel uses asequence b, it indicates that a first communication mode is used betweenthe base station and the terminal device. When the first synchronizationchannel uses a sequence a and the second synchronization channel uses asequence c, it indicates that a second communication mode is usedbetween the base station and the terminal device. Further, when thefirst synchronization channel uses a sequence a and the secondsynchronization channel uses a sequence d, it indicates that a thirdcommunication mode is used between the base station and the terminaldevice; or the like. The sequences a, b, c, and d herein are differentsequences.

For another example, when the first synchronization channel uses asequence a1 and the second synchronization channel uses a sequence b1,it indicates that a first communication mode is used between the basestation and the terminal device. When the first synchronization channeluses a sequence a1 and the second synchronization channel uses asequence b2, it indicates that a second communication mode is usedbetween the base station and the terminal device. When the firstsynchronization channel uses a sequence a2 and the secondsynchronization channel uses a sequence b1, it indicates that a thirdcommunication mode is used between the base station and the terminaldevice. When the first synchronization channel uses a sequence a2 andthe second synchronization channel uses a sequence b2, it indicates thata fourth communication mode is used between the base station and theterminal device. The sequences a1, a2, b1, and b2 herein are differentsequences.

For another example, the interrelationship between the firstsynchronization channel and the second synchronization channel indicatesa mapping manner used by the first synchronization channel and a mappingmanner used by the second synchronization channel. For example, when thefirst synchronization channel uses a first mapping rule and the secondsynchronization channel uses a second mapping rule, it indicates that afirst communication mode is used between the base station and theterminal device. When the first synchronization channel uses a firstmapping rule and the second synchronization channel uses a third mappingrule, it indicates that a second communication mode is used between thebase station and the terminal device. The first mapping rule may be thesame as the second mapping rule. The second mapping rule needs to bedifferent from the third mapping rule. For example, the third mappingrule is a variant or shift of the second mapping rule. For example, thesecond mapping rule is successively performing mapping onto resourceelements in ascending order of frequencies, and the third mapping ruleis successively performing mapping onto resource elements in descendingorder of frequencies.

For another example, the interrelationship between the firstsynchronization channel and the second synchronization channel indicatesa resource used by the first synchronization channel and a resource usedby the second synchronization channel. For example, when the firstsynchronization channel uses a first resource (the resource is one ormore of a time resource, a frequency resource, a power resource, a spaceresource, a code resource, or a scrambling code) and the secondsynchronization channel uses a second resource, it indicates that afirst communication mode is used between the base station and theterminal device. When the first synchronization channel uses a firstresource and the second synchronization channel uses a third resource,it indicates that a second communication mode is used between the basestation and the terminal device.

203. The base station transmits the first channel to the terminaldevice.

In this embodiment of the present invention, after the base stationdetermines the transmission parameter of the first channel according tothe communication mode to be used by the base station, the base stationmay transmit the first channel to the terminal device, where thetransmission parameter of the first channel may carry informationindicating the communication mode to be used by the base station.Therefore, the terminal device can obtain the first channel, and candetermine, according to the transmission parameter of the first channel,the communication mode indicated by the base station to the terminaldevice, so that a process of indicating the communication mode to theterminal device by the base station is completed, and the terminaldevice can determine a specific communication mode used when the basestation and the terminal device communicate with each other.

In some embodiments of the present invention, if the base stationexecutes the implementation of step B1, that the base station transmitsthe first channel to the terminal device in step 203 may specificallyinclude the following step:

C1. The base station sends both the first channel and the second channelto the terminal device.

That is, when two channels (that is, the first channel and the secondchannel) are configured between the base station and the terminaldevice, in the implementation described in step B1, the base stationdetermines the transmission parameter of the first channel and thetransmission parameter of the second channel according to the determinedcommunication mode. In this case, after the transmission parameter ofthe second channel is determined according to the communication mode tobe used between the base station and the terminal device, the basestation may send the second channel to the terminal device in additionto sending the first channel to the terminal device. Correspondingly,the terminal device may receive the first channel sent by the basestation and the second channel sent by the base station. For example,the first channel may be a primary synchronization channel, and thesecond channel may be a secondary synchronization channel. Thecommunication mode to be used by the base station and the terminaldevice may be indicated by using a transmission parameter of the primarysynchronization channel and a transmission parameter of the secondarysynchronization channel. For example, different communication modes maybe distinguished according to a relative location of the primarysynchronization channel and the secondary synchronization channel.

It can be learned from the foregoing descriptions of the presentinvention with reference to this embodiment that, the base station firstdetermines the communication mode to be used between the base stationand the terminal device; after the base station determines thecommunication mode that should be used, the base station determines thetransmission parameter of the first channel according to the determinedcommunication mode; finally, the base station transmits the firstchannel to the terminal device. Because the base station can determinethe transmission parameter of the first channel according to theone-to-one correspondence between the communication mode and thetransmission parameter of the first channel, the first channeltransmitted by the base station to the terminal device can indicate thecommunication mode used by the base station, so as to implementindication of the communication mode. In addition, after the terminaldevice determines the first channel sent by the base station to theterminal device, the terminal device can obtain the transmissionparameter of the first channel from the first channel, and the terminaldevice can determine, according to the one-to-one correspondence betweenthe communication mode and the transmission parameter of the firstchannel, the communication mode used by the base station. According tothe channel transmission method provided in this embodiment of thepresent invention, determining a communication mode by terminal deviceand indicating the communication mode by a base station can beimplemented. Therefore, the base station and the terminal devicecommunicate with each other in the communication mode indicated by thebase station. This improves flexibility of system design, reducescomplexity of blindly detecting a communication mode by the terminaldevice, and reduces power consumption of the terminal device.

In this embodiment of the present invention, one or more of framestructures, reference signals, content carried in broadcast channels, orsystem information in different communication modes may be different.This embodiment of the present invention further provides animplementation in which in different modes, a broadcast channel carriesdifferent master information blocks (MIB). An example is described asfollows:

For example, in a first communication mode, the MIB includes one or moreof the following: a system radio frame number indication, schedulinginformation of a system information block1 (for example, a systeminformation block 1), a physical resource block location of a systeminformation block, a system bandwidth, an indication of an antenna portquantity, or a frequency hopping indication. When the terminal devicedetermines that the base station has indicated the first communicationmode, the terminal device interprets content of the MIB according to astructure of the MIB used in the first communication mode. For example,if the base station has indicated the first communication mode to theterminal device, a specific example of a quantity of information bitsincluded in the MIB is as follows: A system frame number (SFN) has threebits (English: bits), configuration information of a machine-systeminformation block 1 (M-SIB1) has two to four bits, a physical resourceblock location of an M-SIB1 has one or two bits, a system bandwidth hastwo or three bits, an antenna port quantity has one or two bits, or afrequency hopping indication has one or two bits.

For example, in a second communication mode, the MIB includes one ormore of the following: a system radio frame number indication orscheduling information of a system information block (for example, asystem information block 1). When the terminal device determines thatthe base station has indicated the second communication mode, theterminal device interprets content of the MIB according to a structureof the MIB used in the second communication mode. For example, if thebase station has indicated the second communication mode to the terminaldevice, a specific example of a quantity of information bits included inthe MIB is as follows: An SFN has eight bits or configurationinformation of an M-SIB1 has two or three bits.

It can be learned from the descriptions of the foregoing embodimentthat, in this embodiment of the present invention, after determining thecommunication mode, the terminal device may communicate with the basestation according to one or more of a frame structure, a synchronizationchannel, a reference signal, a broadcast channel, a control channel, adata channel, or a common message corresponding to the determinedcommunication mode. Different communication modes may be correspondingto one or more of different frame structures, different synchronizationchannels, different reference signals, different broadcast channels,different control channels, different data channels, or different commonmessages. In this way, quite high flexibility is provided for systemdesign, so that different designs are applied to different communicationmodes, and resource utilization efficiency of a system is improved.

In the foregoing embodiment, the channel transmission method provided inthe embodiments of the present invention is described from a perspectiveof a base station. The channel transmission method provided in theembodiments of the present invention is described in the following froma perspective of terminal device. Another embodiment of a channeltransmission method in the present invention may be applied to ascenario in which a base station sends a channel to terminal device.Referring to FIG. 4, the channel transmission method may include thefollowing steps.

401. Terminal device determines a first channel transmitted by a basestation.

In this embodiment of the present invention, after the base stationdetermines a transmission parameter of the first channel according to acommunication mode used by the base station, the base station maytransmit the first channel to the terminal device, and the terminaldevice determines the first channel transmitted by the base station,where the transmission parameter of the first channel may carryinformation indicating the communication mode used by the base station.

In some embodiments of the present invention, the channel transmissionmethod provided in this embodiment of the present invention may furtherinclude one of the following steps:

D1. When the first channel is a synchronization channel, the terminaldevice determines that different communication modes are correspondingto different transmission parameters of the synchronization channel.

D2. When the first channel is a reference signal, the terminal devicedetermines that different communication modes are corresponding to asame transmission parameter of a synchronization channel.

D3. When the first channel is a broadcast channel, the terminal devicedetermines that different communication modes are corresponding to asame transmission parameter of a synchronization channel and/or a sametransmission parameter of a reference signal.

D4. When the first channel is a physical channel transmitted after abroadcast channel is transmitted, the terminal device determines thatdifferent communication modes are corresponding to at least one of asame transmission parameter of a synchronization channel, a sametransmission parameter of a reference signal, or a same transmissionparameter of the broadcast channel.

For example, the terminal device receives, in the following sequence,various channels sent by the base station: a synchronization channel, areference signal, a broadcast channel, and a physical channel carryingsystem information. Therefore, in the implementation of step D1, thefirst channel is a synchronization channel, and the terminal devicedetermines that different communication modes are corresponding todifferent transmission parameters of the synchronization channel, andthe communication mode and the transmission parameter of thesynchronization channel are in a one-to-one correspondence.

In the implementation of step D2, the first channel is a referencesignal, and the terminal device determines that different communicationmodes are corresponding to different transmission parameters of thereference signal, and the communication mode and the transmissionparameter of the reference signal are in a one-to-one correspondence. Inthis case, a same synchronization channel may be transmitted before thereference signal is transmitted, regardless of a communication mode usedby the base station, so as to reduce complexity caused when differentsynchronization channels need to be transmitted because the base stationand the terminal device use different communication modes. Therefore, ifthe base station indicates the communication mode by using thetransmission parameter of the reference signal, the same synchronizationchannel may be transmitted before the reference signal is transmitted.

In the implementation of step D3, the first channel is a broadcastchannel, and the terminal device determines that different communicationmodes are corresponding to different transmission parameters of thebroadcast channel, and the communication mode and the transmissionparameter of the broadcast channel are in a one-to-one correspondence.In this case, a same synchronization channel and/or reference signal maybe transmitted before the broadcast channel is transmitted, regardlessof a communication mode used by the base station, so as to reducecomplexity caused when different synchronization channels and referencesignals need to be transmitted because the base station and the terminaldevice use different communication modes. Therefore, if the base stationindicates the communication mode by using the transmission parameter ofthe broadcast channel, the same synchronization channel and/or referencesignal may be transmitted before the broadcast channel is transmitted.

In the implementation of step D4, the first channel is a physicalchannel transmitted after a broadcast channel is transmitted, and theterminal device determines that different communication modes arecorresponding to different transmission parameters of the physicalchannel, and the communication mode and the transmission parameter ofthe physical channel are in a one-to-one correspondence. In this case, asame synchronization channel and/or reference signal and/or broadcastchannel may be transmitted before the physical channel is transmitted,regardless of a communication mode used by the base station, so as toreduce complexity caused when different synchronization channels,reference signals, and broadcast channels need to be transmitted becausethe base station and the terminal device use different communicationmodes. Therefore, if the base station indicates the communication modeby using the transmission parameter of the physical channel, the samesynchronization channel and/or reference signal and/or the broadcastchannel may be transmitted before the physical channel is transmitted.

402. The terminal device obtains a transmission parameter of the firstchannel from the first channel.

In this embodiment of the present invention, the terminal devicedetermines that the base station has transmitted the first channel tothe terminal device, and after the terminal device determines the firstchannel, the terminal device may obtain the transmission parameter ofthe first channel from the first channel.

In this embodiment of the present invention, the first channel is achannel determined by the base station and used to indicate acommunication mode. The first channel may be a channel of a knownchannel type, or may be a channel configured between the base stationand the terminal device. A specific implementation of the first channelmay depend on an application scenario. In addition, the second channelis a channel determined by the base station and used to indicate acommunication mode. The second channel may be a channel of a knownchannel type, or may be a channel configured between the base stationand the terminal device. A specific implementation of the second channelmay depend on an application scenario. In an example, the first channelincludes at least one of the following content: a synchronizationchannel, a reference signal, a broadcast channel, or a physical channelcarrying system information; and/or the second channel includes at leastone of the following content: a synchronization channel, a referencesignal, a broadcast channel, or a physical channel carrying systeminformation. For example, the first channel may be a synchronizationchannel, a reference signal, a broadcast channel, or a physical channelcarrying system information, and the second channel may be asynchronization channel, a reference signal, a broadcast channel, or aphysical channel carrying system information. For example, when both thefirst channel and the second channel represent a synchronizationchannel, the first channel may be specifically a primary synchronizationchannel, and the second channel may be specifically a secondarysynchronization channel.

In some embodiments of the present invention, the transmission parameterof the first channel includes at least one of the following information:a sequence used by the first channel, a time resource used fortransmitting the first channel, a frequency resource used fortransmitting the first channel, a mapping manner used by the firstchannel, a spatial coding matrix used by the first channel, a scramblingcode used for scrambling information in the first channel, orinformation in the first channel; and/or

the transmission parameter of the second channel includes at least oneof the following information: a sequence used by the second channel, atime resource used for transmitting the second channel, a frequencyresource used for transmitting the second channel, a mapping manner usedby the second channel, a spatial coding matrix used by the secondchannel, a scrambling code used for scrambling information in the secondchannel, or information in the second channel. The information in thefirst channel is information carried in the first channel, or a field oran information element carried in the first channel. The information inthe second channel is information carried in the second channel, or afield or an information element carried in the second channel.

The transmission parameter of the first channel and/or the transmissionparameter of the second channel may be implemented in a plurality ofdifferent manners, provided that these transmission parameters can beuniquely determined according to the communication mode determined bythe base station and used between the base station and the terminaldevice. After the terminal device obtains the transmission parameter ofthe first channel and/or the transmission parameter of the secondchannel from the base station, the terminal device may uniquelydetermine, according to these transmission parameters, a communicationmode that should be used and that is indicated by the base station tothe terminal device.

In a specific implementation, the transmission parameter of the firstchannel is used as an example. There may be a unique correspondencebetween the sequence used by the first channel and the communicationmode, and each of different sequences used by the first channel isuniquely corresponding to a communication mode. There may be a uniquecorrespondence between the time resource used by the first channel andthe communication mode, and each of different time resources used by thefirst channel is uniquely corresponding to a communication mode. Theremay be a unique correspondence between the frequency resource used bythe first channel and the communication mode, and each of differentfrequency resources used by the first channel is uniquely correspondingto a communication mode. There may be a unique correspondence betweenthe mapping manner used by the first channel and the communication mode,and each of different mapping manners used by the first channel isuniquely corresponding to a communication mode. There may be a uniquecorrespondence between the spatial coding matrix used by the firstchannel and the communication mode, and each of different spatial codingmatrices used by the first channel is uniquely corresponding to acommunication mode. There may be a unique correspondence between thescrambling code used for scrambling the information in the first channeland the communication mode, and each of different scrambling codes usedfor scrambling information in the first channel is uniquelycorresponding to a communication mode. There may be a uniquecorrespondence between the information in the first channel and thecommunication mode, and each piece of different information in the firstchannel is uniquely corresponding to a communication mode. It should benoted that, in the foregoing embodiment, the information in the firstchannel may be information carried in the first channel or bit contentcarried in the first channel. In specific implementation, alternatively,the information in the first channel may specifically representdifferent information when channel types represented by the firstchannel are different. In addition, the information in the first channelmay be a plurality of types of information in the first channel. Forexample, when the first channel is a broadcast channel, the informationin the first channel may be a cyclic redundancy check bit, or may be aninformation bit carried in the broadcast channel.

403. The terminal device determines, according to the transmissionparameter of the first channel, a communication mode used between thebase station and the terminal device, where the communication mode andthe transmission parameter of the first channel are in a one-to-onecorrespondence.

In this embodiment of the present invention, after the terminal deviceobtains the transmission parameter of the first channel, differentcommunication modes are corresponding to different transmissionparameters of the first channel, and the communication mode and thetransmission parameter of the first channel are in a one-to-onecorrespondence. The one-to-one correspondence between the communicationmode and the transmission parameter of the first channel may bepre-defined by a system, or may be determined by the base station andnotified by the base station to the terminal device. Therefore, theterminal device can determine, according to the transmission parameter,the communication mode indicated by the base station to the terminaldevice. The terminal device can determine, according to the transmissionparameter of the first channel, the communication mode indicated by thebase station to the terminal device, so that a process of indicating thecommunication mode to the terminal device by the base station iscompleted, and the terminal device can determine a specificcommunication mode used when the base station and the terminal devicecommunicate with each other. In an example, a plurality of communicationmodes may be configured between the base station and the terminaldevice. For example, there are a total of three communication modesbetween the base station and the terminal device, and the threecommunication modes are a communication mode a, a communication mode b,and a communication mode c, and are corresponding to differenttransmission parameters of the first channel. It is assumed that thecommunication mode and the transmission parameter of the first channelthat are configured on the base station side are in the followingone-to-one correspondence: The communication mode a is uniquelycorresponding to a transmission parameter x, the communication mode b isuniquely corresponding to a transmission parameter y, and thecommunication mode c is uniquely corresponding to a transmissionparameter z. The terminal device first determines that the transmissionparameter of the first channel is the transmission parameter y, and theterminal device determines, according to the one-to-one correspondenceand according to a case in which the transmission parameter of the firstchannel is the transmission parameter y, that the communication modeindicated by the base station to the terminal device is thecommunication mode b.

In some embodiments of the present invention, the channel transmissionmethod provided in the present invention may further include thefollowing steps:

E1. The terminal device determines a second channel transmitted by thebase station.

E2. The terminal device obtains a transmission parameter of the secondchannel from the second channel.

It can be learned from the example described in the foregoing embodimentthat, in this embodiment of the present invention, the base station maysend both the first channel and the second channel to the terminaldevice. The terminal device may further perform steps E1 and E2 inaddition to performing steps 401 and 402. In this way, the terminaldevice can obtain the transmission parameter of the first channel andthe transmission parameter of the second channel. In this implementationscenario, that the terminal device determines, according to thetransmission parameter of the first channel, a communication mode usedbetween the base station and the terminal device in step 403 mayspecifically include the following steps:

F1. The terminal device determines the communication mode according tothe transmission parameter of the first channel and the transmissionparameter of the second channel, where the communication mode and atransmission parameter set are in a one-to-one correspondence, and thetransmission parameter set includes the transmission parameter of thefirst channel and the transmission parameter of the second channel.Different communication modes are corresponding to differenttransmission parameter sets. The transmission parameter set includes thetransmission parameter of the first channel and the transmissionparameter of the second channel. After the terminal device obtains thetransmission parameter of the first channel and the transmissionparameter of the second channel, the terminal device determines thetransmission parameter set corresponding to the transmission parameterof the first channel and the transmission parameter of the secondchannel. The transmission parameter set and the communication mode maybe in a one-to-one correspondence. Therefore, the terminal device candetermine a communication mode corresponding to the obtainedtransmission parameter set, so that the terminal device can obtain thecommunication mode indicated by the base station to the terminal device.

Further, in some embodiments of the present invention, that the terminaldevice determines the communication mode according to the transmissionparameter of the first channel and the transmission parameter of thesecond channel in step F1 may specifically include the following steps:

F11. The terminal device determines the communication mode according toa transmission parameter interrelationship, where the transmissionparameter interrelationship is an interrelationship between thetransmission parameter of the first channel and the transmissionparameter of the second channel.

In some embodiments of the present invention, that the base stationdetermines the transmission parameter of the first channel and thetransmission parameter of the second channel according to the determinedcommunication mode may be specifically determining the transmissionparameter interrelationship, that is, the base station determines thetransmission parameter interrelationship according to the determinedcommunication mode, so as to indicate, according to the transmissionparameter interrelationship, the communication mode determined by thebase station. The communication mode determined by the base station andthe transmission parameter interrelationship are in a one-to-onecorrespondence, that is, different transmission parameterinterrelationships are corresponding to different communication modes.The interrelationship is a relationship between the transmissionparameter of the first channel and the transmission parameter of thesecond channel. After the terminal device obtains the transmissionparameter of the first channel and the transmission parameter of thesecond channel from the base station, the terminal device determines,based on the interrelationship between the transmission parameter of thefirst channel and the transmission parameter of the second channel, thecommunication mode indicated by the base station to the terminal device.

In some embodiments of the present invention, the transmission parameterinterrelationship includes at least one of the following information: atime interval between a time resource used for transmitting the firstchannel and a time resource used for transmitting the second channel, asequence used by the first channel and a sequence used by the secondchannel, a mapping manner used by the first channel and a mapping mannerused by the second channel, or a resource used by the first channel anda resource used by the second channel.

The resource used by the first channel may be specifically one or moreof a time resource, a frequency resource, a power resource, a spaceresource, a code resource, or a scrambling code. The resource used bythe second channel may be specifically one or more of a time resource, afrequency resource, a power resource, a space resource, a code resource,or a scrambling code.

In an example, if a synchronization channel includes a firstsynchronization channel (for example, a primary synchronization channel)and a second synchronization channel (for example, a secondarysynchronization channel), the first channel may be the firstsynchronization channel, and the second channel may be the secondsynchronization channel. The communication mode may be determinedaccording to an interrelationship between the first synchronizationchannel and the second synchronization channel. For example, theinterrelationship between the first synchronization channel and thesecond synchronization channel indicates a time interval between thefirst synchronization channel and the second synchronization channel.When the time interval between the first synchronization channel and thesecond synchronization channel is a first time interval, it indicatesthat a first communication mode is used between the base station and theterminal device. When the time interval between the firstsynchronization channel and the second synchronization channel is asecond time interval, it indicates that a second communication mode isused between the base station and the terminal device. Further, when thetime interval between the first synchronization channel and the secondsynchronization channel is a third time interval, it indicates that athird communication mode is used between the base station and theterminal device; or the like.

In some embodiments of the present invention, the communication modeincludes at least one of the following modes: an in-band mode, aguardband mode, or an standalone mode. In a transmission bandwidth of alegacy carrier, not only a legacy mode (for example, for an LTE system,a legacy mode is an LTE air interface standard) but also anothercommunication mode used for another terminal device are supported, andthe another communication mode used for another terminal device isreferred to as an in-band mode for short, and the in-band mode may alsobe referred to as a sharing mode. For another example, in anothercommunication mode, another communication mode is supported in a guardbandwidth of a legacy carrier. For example, a first communication modeis used in a transmission bandwidth of the legacy carrier, and a secondcommunication mode is used in the guard bandwidth of the legacy carrier(generally, in the first communication mode, this part of bandwidth isnot used to transmit data, another signal, or the like). Forconvenience, a mode in which the second communication mode is used inthe guard bandwidth of the legacy carrier for communication is referredto as a guardband mode for short. For another example, in anothercommunication mode, a first communication mode is supported on a legacycarrier, and a second communication mode is supported on anotherfrequency resource (that is, on a frequency resource of a non-legacycarrier). For convenience, a mode in which the second communication modeis used on the another frequency resource (that is, on the frequencyresource of the non-legacy carrier) for communication is referred to asan standalone mode for short.

It can be learned from the foregoing descriptions of the presentinvention with reference to this embodiment that, the terminal devicedetermines the first channel transmitted by the base station, theterminal device obtains the transmission parameter of the first channelfrom the first channel, and the terminal device determines, according tothe transmission parameter of the first channel, the communication modeused between the base station and the terminal device, where thecommunication mode and the transmission parameter of the first channelare in a one-to-one correspondence, so as to implement determining ofthe communication mode. In addition, after the terminal devicedetermines the first channel sent by the base station to the terminaldevice, the terminal device can obtain the transmission parameter of thefirst channel from the first channel, and the terminal device candetermine, according to the one-to-one correspondence between thecommunication mode and the transmission parameter of the first channel,the communication mode used by the base station. According to thechannel transmission method provided in this embodiment of the presentinvention, determining a communication mode by terminal device andindicating the communication mode by a base station can be implemented.Therefore, the base station and the terminal device communicate witheach other in the communication mode indicated by the base station. Thisimproves flexibility of system design, reduces complexity of blindlydetecting a communication mode by the terminal device, and reduces powerconsumption of the terminal device.

It should be noted that, for ease of description, the foregoing methodembodiments are described as a series of action combinations. However,persons skilled in the art should know that, the present invention isnot limited by the described action sequence, because some steps may beperformed in another sequence or simultaneously according to anembodiment of present disclosure. In addition, persons skilled in theart should also understand that all the embodiments described in thisspecification are embodiments, and the actions and modules in theembodiments are not necessarily mandatory to the present invention.

To better implement the foregoing solutions in the embodiments of thepresent invention, the following further provides related apparatusesfor implementing the foregoing solutions.

Referring to FIG. 5, a base station 500 provided in an embodiment of thepresent invention may include a mode determining module 501, a parameterdetermining module 502, and a transmission module 503.

The mode determining module 501 is configured to determine acommunication mode to be used between the base station and terminaldevice.

The parameter determining module 502 is configured to determine atransmission parameter of a first channel according to the determinedcommunication mode, where the communication mode and the transmissionparameter of the first channel are in a one-to-one correspondence.

The transmission module 503 is configured to transmit the first channelto the terminal device.

In some embodiments of the present invention, the parameter determiningmodule 502 is specifically configured to determine the transmissionparameter of the first channel and a transmission parameter of a secondchannel according to the determined communication mode, where thecommunication mode and a transmission parameter set are in a one-to-onecorrespondence, and the transmission parameter set includes thetransmission parameter of the first channel and the transmissionparameter of the second channel.

The transmission module 503 is specifically configured to send both thefirst channel and the second channel to the terminal device.

In some embodiments of the present invention, the transmission parameterof the first channel includes at least one of the following information:a sequence used by the first channel, a time resource used fortransmitting the first channel, a frequency resource used fortransmitting the first channel, a mapping manner used by the firstchannel, a spatial coding matrix used by the first channel, a scramblingcode used for scrambling information in the first channel, orinformation in the first channel; and/or

the transmission parameter of the second channel includes at least oneof the following information: a sequence used by the second channel, atime resource used for transmitting the second channel, a frequencyresource used for transmitting the second channel, a mapping manner usedby the second channel, a spatial coding matrix used by the secondchannel, a scrambling code used for scrambling information in the secondchannel, or information in the second channel.

In some embodiments of the present invention, the first channel includesat least one of the following content: a synchronization channel, areference signal, a broadcast channel, or a physical channel carryingsystem information; and/or

the second channel includes at least one of the following content: asynchronization channel, a reference signal, a broadcast channel, or aphysical channel carrying system information.

In some embodiments of the present invention, the parameter determiningmodule 502 is specifically configured to: determine a transmissionparameter of a synchronization channel according to the determinedcommunication mode, where different communication modes arecorresponding to different transmission parameters of thesynchronization channel; or determine a transmission parameter of areference signal according to the determined communication mode, wheredifferent communication modes are corresponding to a same transmissionparameter of a synchronization channel; or determine a transmissionparameter of a broadcast channel according to the determinedcommunication mode, where different communication modes arecorresponding to a same transmission parameter of a synchronizationchannel and/or a same transmission parameter of a reference signal; ordetermine, according to the determined communication mode, atransmission parameter of a physical channel transmitted after abroadcast channel is transmitted, where different communication modesare corresponding to at least one of a same transmission parameter of asynchronization channel, a same transmission parameter of a referencesignal, or a same transmission parameter of the broadcast channel.

In some embodiments of the present invention, the parameter determiningmodule 502 is specifically configured to determine a transmissionparameter interrelationship according to the determined communicationmode, where the transmission parameter interrelationship is aninterrelationship between the transmission parameter of the firstchannel and the transmission parameter of the second channel.

In some embodiments of the present invention, the transmission parameterinterrelationship includes at least one of the following information: atime interval between a time resource used for transmitting the firstchannel and a time resource used for transmitting the second channel, asequence used by the first channel and a sequence used by the secondchannel, a mapping manner used by the first channel and a mapping mannerused by the second channel, or a resource used by the first channel anda resource used by the second channel.

In some embodiments of the present invention, the communication modeincludes at least one of the following modes: an in-band mode, aguardband mode, or an standalone mode.

It can be learned from the foregoing descriptions of the presentinvention with reference to this embodiment that, the base station firstdetermines the communication mode to be used between the base stationand the terminal device; after the base station determines thecommunication mode that should be used, the base station determines thetransmission parameter of the first channel according to the determinedcommunication mode; finally, the base station transmits the firstchannel to the terminal device. Because the base station can determinethe transmission parameter of the first channel according to theone-to-one correspondence between the communication mode and thetransmission parameter of the first channel, the first channeltransmitted by the base station to the terminal device can indicate thecommunication mode used by the base station, so as to implementindication of the communication mode. In addition, after the terminaldevice determines the first channel sent by the base station to theterminal device, the terminal device can obtain the transmissionparameter of the first channel from the first channel, and the terminaldevice can determine, according to the one-to-one correspondence betweenthe communication mode and the transmission parameter of the firstchannel, the communication mode used by the base station, so as tocomplete determining of the communication mode. According to the channeltransmission method provided in this embodiment of the presentinvention, determining a communication mode by terminal device andindicating the communication mode by a base station can be implemented.Therefore, the base station and the terminal device communicate witheach other in the communication mode indicated by the base station. Thisimproves flexibility of system design, reduces complexity of blindlydetecting a communication mode by the terminal device, and reduces powerconsumption of the terminal device.

Referring to FIG. 6, terminal device 600 provided in an embodiment ofthe present invention may include a channel determining module 601, aparameter obtaining module 602, and a mode determining module 603.

The channel determining module 601 is configured to determine a firstchannel transmitted by a base station.

The parameter obtaining module 602 is configured to obtain atransmission parameter of the first channel from the first channel.

The mode determining module 603 is configured to determine, according tothe transmission parameter of the first channel, a communication modeused between the base station and the terminal device, where thecommunication mode and the transmission parameter of the first channelare in a one-to-one correspondence.

In some embodiments of the present invention, the channel determiningmodule 601 is further configured to determine a second channeltransmitted by the base station;

the parameter obtaining module 602 is further configured to obtain atransmission parameter of the second channel from the second channel;and

the mode determining module 603 is specifically configured to determinethe communication mode according to the transmission parameter of thefirst channel and the transmission parameter of the second channel,where the communication mode and a transmission parameter set are in aone-to-one correspondence, and the transmission parameter set includesthe transmission parameter of the first channel and the transmissionparameter of the second channel.

In some embodiments of the present invention, the transmission parameterof the first channel includes at least one of the following information:a sequence used by the first channel, a time resource used fortransmitting the first channel, a frequency resource used fortransmitting the first channel, a mapping manner used by the firstchannel, a spatial coding matrix used by the first channel, a scramblingcode used for scrambling information in the first channel, orinformation in the first channel; and/or

the transmission parameter of the second channel includes at least oneof the following information: a sequence used by the second channel, atime resource used for transmitting the second channel, a frequencyresource used for transmitting the second channel, a mapping manner usedby the second channel, a spatial coding matrix used by the secondchannel, a scrambling code used for scrambling information in the secondchannel, or information in the second channel.

In some embodiments of the present invention, the first channel includesat least one of the following content: a synchronization channel, areference signal, a broadcast channel, or a physical channel carryingsystem information; and/or

the second channel includes at least one of the following content: asynchronization channel, a reference signal, a broadcast channel, or aphysical channel carrying system information.

In some embodiments of the present invention, the parameter obtainingmodule 602 is further configured to: when the first channel is asynchronization channel, determine that different communication modesare corresponding to different transmission parameters of thesynchronization channel; or when the first channel is a referencesignal, determine that different communication modes are correspondingto a same transmission parameter of a synchronization channel; or whenthe first channel is a broadcast channel, determine that differentcommunication modes are corresponding to a same transmission parameterof a synchronization channel and/or a same transmission parameter of thereference signal; or when the first channel is a physical channeltransmitted after a broadcast channel is transmitted, determine thatdifferent communication modes are corresponding to at least one of asame transmission parameter of a synchronization channel, a sametransmission parameter of a reference signal, or a same transmissionparameter of the broadcast channel.

In some embodiments of the present invention, the mode determiningmodule 603 is specifically configured to determine the communicationmode according to a transmission parameter interrelationship, where thetransmission parameter interrelationship is an interrelationship betweenthe transmission parameter of the first channel and the transmissionparameter of the second channel.

In some embodiments of the present invention, the transmission parameterinterrelationship includes at least one of the following information: atime interval between a time resource used for transmitting the firstchannel and a time resource used for transmitting the second channel, asequence used by the first channel and a sequence used by the secondchannel, a mapping manner used by the first channel and a mapping mannerused by the second channel, or a resource used by the first channel anda resource used by the second channel.

In some embodiments of the present invention, the communication modeincludes at least one of the following modes: an in-band mode, aguardband mode, or an standalone mode.

It can be learned from the foregoing descriptions of the presentinvention with reference to this embodiment that, the terminal devicedetermines the first channel transmitted by the base station, theterminal device obtains the transmission parameter of the first channelfrom the first channel, and the terminal device determines, according tothe transmission parameter of the first channel, the communication modeused between the base station and the terminal device, where thecommunication mode and the transmission parameter of the first channelare in a one-to-one correspondence, so as to implement determining ofthe communication mode. In addition, after the terminal devicedetermines the first channel sent by the base station to the terminaldevice, the terminal device can obtain the transmission parameter of thefirst channel from the first channel, and the terminal device candetermine, according to the one-to-one correspondence between thecommunication mode and the transmission parameter of the first channel,the communication mode used by the base station. According to thechannel transmission method provided in this embodiment of the presentinvention, determining a communication mode by terminal device andindicating the communication mode by a base station can be implemented.Therefore, the base station and the terminal device communicate witheach other in the communication mode indicated by the base station. Thisimproves flexibility of system design, reduces complexity of blindlydetecting a communication mode by the terminal device, and reduces powerconsumption of the terminal device.

It should be noted that, content such as information exchange betweenmodules/units of the foregoing apparatus and the implementationprocesses thereof is based on the same conception as the methodembodiments of the present invention and brings the same technicaleffects as those of the method embodiments of the present invention. Forspecific content, refer to the descriptions in the foregoing methodembodiments. No repetition is given here any further.

An embodiment of the present invention further provides a computerstorage medium. The computer storage medium stores a program, and theprogram is used to perform some or all of steps described in theforegoing method embodiments.

The following describes another base station provided in an embodimentof the present invention. Referring to FIG. 7, a base station 700includes:

a receiver 701, a transmitter 702, a processor 703, and a memory 704(there may be one or more processors 703 in the base station 700, and anexample in which there is one processor is used in FIG. 7). In someembodiments of the present invention, the receiver 701, the transmitter702, the processor 703, and the memory 704 may be connected by using abus or in another manner. In FIG. 7, a bus connection is used as anexample.

The processor 703 is configured to perform the following steps:

determining a communication mode to be used between the base station andterminal device;

determining a transmission parameter of a first channel according to thedetermined communication mode, where the communication mode and thetransmission parameter of the first channel are in a one-to-onecorrespondence; and

transmitting the first channel to the terminal device.

In some embodiments of the present invention, the processor 703 isspecifically configured to perform the following steps:

determining the transmission parameter of the first channel and atransmission parameter of a second channel according to the determinedcommunication mode, where the communication mode and a transmissionparameter set are in a one-to-one correspondence, and the transmissionparameter set includes the transmission parameter of the first channeland the transmission parameter of the second channel; and

sending both the first channel and the second channel to the terminaldevice.

In some embodiments of the present invention, the transmission parameterof the first channel stored in the memory 704 includes at least one ofthe following information: a sequence used by the first channel, a timeresource used for transmitting the first channel, a frequency resourceused for transmitting the first channel, a mapping manner used by thefirst channel, a spatial coding matrix used by the first channel, ascrambling code used for scrambling information in the first channel, orinformation in the first channel; and/or

the transmission parameter of the second channel includes at least oneof the following information: a sequence used by the second channel, atime resource used for transmitting the second channel, a frequencyresource used for transmitting the second channel, a mapping manner usedby the second channel, a spatial coding matrix used by the secondchannel, a scrambling code used for scrambling information in the secondchannel, or information in the second channel.

In some embodiments of the present invention, the first channel storedin the memory 704 includes at least one of the following content: asynchronization channel, a reference signal, a broadcast channel, or aphysical channel carrying system information; and/or

the second channel includes at least one of the following content: asynchronization channel, a reference signal, a broadcast channel, or aphysical channel carrying system information.

In some embodiments of the present invention, the processor 703 isspecifically configured to perform the following step:

determining a transmission parameter of a synchronization channelaccording to the determined communication mode, where differentcommunication modes are corresponding to different transmissionparameters of the synchronization channel; or

determining a transmission parameter of a reference signal according tothe determined communication mode, where different communication modesare corresponding to a same transmission parameter of a synchronizationchannel; or

determining a transmission parameter of a broadcast channel according tothe determined communication mode, where different communication modesare corresponding to a same transmission parameter of a synchronizationchannel and/or a same transmission parameter of a reference signal; or

determining, according to the determined communication mode, atransmission parameter of a physical channel transmitted after abroadcast channel is transmitted, where different communication modesare corresponding to at least one of a same transmission parameter of asynchronization channel, a same transmission parameter of a referencesignal, or a same transmission parameter of the broadcast channel.

In some embodiments of the present invention, the processor 703 isspecifically configured to perform the following step:

determining a transmission parameter interrelationship according to thedetermined communication mode, where the transmission parameterinterrelationship is an interrelationship between the transmissionparameter of the first channel and the transmission parameter of thesecond channel.

In some embodiments of the present invention, the transmission parameterinterrelationship stored in the memory 704 includes at least one of thefollowing information: a time interval between a time resource used fortransmitting the first channel and a time resource used for transmittingthe second channel, a sequence used by the first channel and a sequenceused by the second channel, a mapping manner used by the first channeland a mapping manner used by the second channel, or a resource used bythe first channel and a resource used by the second channel.

In some embodiments of the present invention, the communication modestored in the memory 704 includes at least one of the following modes:an in-band mode, a guardband mode, or an standalone mode.

It can be learned from the foregoing descriptions of the presentinvention with reference to this embodiment that, the base station firstdetermines the communication mode to be used between the base stationand the terminal device; after the base station determines thecommunication mode that should be used, the base station determines thetransmission parameter of the first channel according to the determinedcommunication mode; finally, the base station transmits the firstchannel to the terminal device. Because the base station can determinethe transmission parameter of the first channel according to theone-to-one correspondence between the communication mode and thetransmission parameter of the first channel, the first channeltransmitted by the base station to the terminal device can indicate thecommunication mode used by the base station, so as to implementindication of the communication mode. In addition, after the terminaldevice determines the first channel sent by the base station to theterminal device, the terminal device can obtain the transmissionparameter of the first channel from the first channel, and the terminaldevice can obtain, according to the one-to-one correspondence betweenthe communication mode and the transmission parameter of the firstchannel, the communication mode used by the base station. According tothe channel transmission method provided in this embodiment of thepresent invention, determining a communication mode by terminal deviceand indicating the communication mode by a base station can beimplemented. Therefore, the base station and the terminal devicecommunicate with each other in the communication mode indicated by thebase station. This improves flexibility of system design, reducescomplexity of blindly detecting a communication mode by the terminaldevice, and reduces power consumption of the terminal device.

The following describes another terminal device provided in anembodiment of the present invention. Referring to FIG. 8, terminaldevice 800 includes:

a receiver 801, a transmitter 802, a processor 803, and a memory 804(there may be one or more processors 803 in the terminal device 800, andan example in which there is one processor is used in FIG. 8). In someembodiments of the present invention, the receiver 801, the transmitter802, the processor 803, and the memory 804 may be connected by using abus or in another manner. In FIG. 8, a bus connection is used as anexample.

The processor 803 is configured to perform the following steps:

determining a first channel transmitted by a base station:

obtaining a transmission parameter of the first channel from the firstchannel; and

determining, according to the transmission parameter of the firstchannel, a communication mode used between the base station and theterminal device, where the communication mode and the transmissionparameter of the first channel are in a one-to-one correspondence.

In some embodiments of the present invention, the processor 803 isfurther configured to perform the following steps:

determining a second channel transmitted by the base station; and

obtaining a transmission parameter of the second channel from the secondchannel; and

further, the processor 803 is specifically configured to perform thefollowing step:

determining the communication mode according to the transmissionparameter of the first channel and the transmission parameter of thesecond channel, where the communication mode and a transmissionparameter set are in a one-to-one correspondence, and the transmissionparameter set includes the transmission parameter of the first channeland the transmission parameter of the second channel.

In some embodiments of the present invention, the transmission parameterof the first channel stored in the memory 804 includes at least one ofthe following information: a sequence used by the first channel, a timeresource used for transmitting the first channel, a frequency resourceused for transmitting the first channel, a mapping manner used by thefirst channel, a spatial coding matrix used by the first channel, ascrambling code used for scrambling information in the first channel, orinformation in the first channel; and/or

the transmission parameter of the second channel includes at least oneof the following information: a sequence used by the second channel, atime resource used for transmitting the second channel, a frequencyresource used for transmitting the second channel, a mapping manner usedby the second channel, a spatial coding matrix used by the secondchannel, a scrambling code used for scrambling information in the secondchannel, or information in the second channel.

In some embodiments of the present invention, the first channel storedin the memory 804 includes at least one of the following content: asynchronization channel, a reference signal, a broadcast channel, or aphysical channel carrying system information; and; or

the second channel includes at least one of the following content: asynchronization channel, a reference signal, a broadcast channel, or aphysical channel carrying system information.

In some embodiments of the present invention, the processor 803 isspecifically configured to perform the following step: when the firstchannel is a synchronization channel, determining that differentcommunication modes are corresponding to different transmissionparameters of the synchronization channel; or when the first channel isa reference signal, determining that different communication modes arecorresponding to a same transmission parameter of a synchronizationchannel; or when the first channel is a broadcast channel, determiningthat different communication modes are corresponding to a sametransmission parameter of a synchronization channel and/or a sametransmission parameter of the reference signal; or when the firstchannel is a physical channel transmitted after a broadcast channel istransmitted, determining that different communication modes arecorresponding to at least one of a same transmission parameter of asynchronization channel, a same transmission parameter of a referencesignal, or a same transmission parameter of the broadcast channel.

In some embodiments of the present invention, the processor 803 isspecifically configured to perform the following step:

determining the communication mode according to a transmission parameterinterrelationship, where the transmission parameter interrelationship isan interrelationship between the transmission parameter of the firstchannel and the transmission parameter of the second channel.

In some embodiments of the present invention, the transmission parameterinterrelationship stored in the memory 804 includes at least one of thefollowing information: a time interval between a time resource used fortransmitting the first channel and a time resource used for transmittingthe second channel, a sequence used by the first channel and a sequenceused by the second channel, a mapping manner used by the first channeland a mapping manner used by the second channel, or a resource used bythe first channel and a resource used by the second channel.

In some embodiments of the present invention, the communication modestored in the memory 804 includes at least one of the following modes:an in-band mode, a guardband mode, or an standalone mode.

It can be learned from the foregoing descriptions of the presentinvention with reference to this embodiment that, the terminal devicedetermines the first channel transmitted by the base station, the UEobtains the transmission parameter of the first channel from the firstchannel, and the UE determines, according to the transmission parameterof the first channel, the communication mode used between the basestation and the terminal device, where the communication mode and thetransmission parameter of the first channel are in a one-to-onecorrespondence, so as to implement determining of the communicationmode. In addition, after the terminal device determines the firstchannel sent by the base station to the terminal device, the UE canobtain the transmission parameter of the first channel from the firstchannel, and the terminal device can determine, according to theone-to-one correspondence between the communication mode and thetransmission parameter of the first channel, the communication mode usedby the base station. According to the channel transmission methodprovided in this embodiment of the present invention, determining acommunication mode by terminal device and indicating the communicationmode by a base station can be implemented. Therefore, the base stationand the terminal device communicate with each other in the communicationmode indicated by the base station. This improves flexibility of systemdesign, reduces complexity of blindly detecting a communication mode bythe terminal device, and reduces power consumption of the terminaldevice.

In addition, it should be noted that the described apparatus embodimentis merely an example. The units described as separate parts may or maynot be physically separate, and parts displayed as units may or may notbe physical units, may be located in one position, or may be distributedon a plurality of network units. Some or all the modules may be selectedaccording to actual needs to achieve the objectives of the solutions ofthe embodiments. In addition, in the accompanying drawings of theapparatus embodiments provided in the present invention, connectionrelationships between modules indicate that the modules are incommunication connections with each other, which may be specificallyimplemented as one or more communications buses or signal cables.Persons of ordinary skill in the art may understand and implement theembodiments of the present invention without creative efforts.

Based on the description of the foregoing implementations, personsskilled in the art may clearly understand that the present invention maybe implemented by software in addition to necessary universal hardware,or by dedicated hardware, including a dedicated integrated circuit, adedicated CPU, a dedicated memory, a dedicated component, and the like.Generally, any functions that are performed by a computer program can beeasily implemented by using corresponding hardware. Moreover, a specifichardware structure used to implement a same function may be of variousforms, for example, in a form of an analog circuit, a digital circuit,or a dedicated circuit. However, as for the present invention, softwareprogram implementation is a better implementation in most cases. Basedon such an understanding, the technical solutions of the presentinvention essentially or the part contributing to the prior art may beimplemented in a form of a software product. The computer softwareproduct is stored in a readable storage medium, such as a floppy disk, aUSB flash drive, a removable hard disk, a read-only memory (ROM), arandom access memory (RAM), a magnetic disk, or an optical disc of acomputer, and includes several instructions for instructing a computerdevice (which may be a personal computer, a server, a network device, orthe like) to perform the methods described in the embodiments of thepresent invention.

In conclusion, the foregoing embodiments are merely intended fordescribing the technical solutions of the present invention, but not forlimiting the present invention. Although the present invention isdescribed in detail with reference to the foregoing embodiments, personsof ordinary skill in the art should understand that they may still makemodifications to the technical solutions described in the foregoingembodiments or make equivalent replacements to some technical featuresthereof, without departing from the spirit and scope of the technicalsolutions in the embodiments of the present invention.

The invention claimed is:
 1. A channel transmission method, comprising:receiving, by a terminal device, a physical broadcast channel (PBCH)from a network device; obtaining, by the terminal device, a transmissionparameter set of the PBCH, wherein the transmission parameter setcomprises carrier frequency resource used for transmitting the PBCH andinformation in the PBCH; determining, by the terminal device, a framestructure used between the network device and the terminal deviceaccording to relationship between the transmission parameter set of thePBCH and the frame structure; and communicating, by the terminal device,with the network device according to the frame structure.
 2. The methodaccording to claim 1, wherein the information in the PBCH comprises:information carried in the PBCH; a field carried in the PBCH; or aninformation element carried in the PBCH.
 3. A non-transitory computerreadable medium storing program codes which, when executed by one ormore processors, cause the one or more processors to perform operationscomprising: receiving a physical broadcast channel (PBCH) from a networkdevice; obtaining a transmission parameter set of the PBCH, wherein thetransmission parameter set comprises carrier frequency resource used fortransmitting the PBCH and information in the PBCH; determining a framestructure used between the network device and a terminal deviceaccording to relationship between a transmission parameter set of thePBCH and the frame structure; and communicating with the network deviceaccording to the frame structure.
 4. The non-transitory computerreadable medium according to claim 3, wherein the information in thePBCH comprises: information carried in the PBCH; a field carried in thePBCH; or an information element carried in the PBCH.
 5. A channeltransmission method, comprising: determining, by a network device, acommunications air interface technology to be used between the networkdevice and a terminal device, wherein different communications airinterface technologies correspond to different frame structures;determining, by the network device, a transmission parameter set of aphysical broadcast channel (PBCH) according to relationship between thetransmission parameter set of the PBCH and a frame structure, whereinthe transmission parameter set of the PBCH indicates the frame structureto be used between the network device and the terminal device;transmitting, by the network device, the PBCH to the terminal device;and communicating, by the network device, with the terminal device byusing the frame structure corresponding to the communications airinterface technology.
 6. The method according to claim 5, wherein thetransmission parameter set comprises carrier frequency resource used fortransmitting the PBCH and information in the PBCH.
 7. The methodaccording to claim 6, wherein the information in the PBCH comprises:information carried in the PBCH; a field carried in the PBCH; or aninformation element carried in the PBCH.
 8. A non-transitory computerreadable medium storing program codes which, when executed by one ormore processors, cause the one or more processors to perform operationscomprising: determining communications air interface technology, whereindifferent communications air interface technologies correspond todifferent frame structures; determining a transmission parameter set ofa physical broadcast channel (PBCH) according to relationship betweenthe transmission parameter set of the PBCH and a frame structure,wherein the transmission parameter set of the PBCH indicates the framestructure to be used between a network device and a terminal device;transmitting the PBCH to the terminal device; and communicating with theterminal device by using the frame structure corresponding to thecommunications air interface technology.
 9. The non-transitory computerreadable medium according to claim 8, wherein information in the PBCHcomprises: information carried in the PBCH; a field carried in the PBCH;or an information element carried in the PBCH.
 10. A communicationapparatus, comprising: a receiver, the receiver configured to receive aphysical broadcast channel (PBCH) from a network device; at least oneprocessor; one or more memories coupled to the at least one processorand storing programming instructions for execution by the at least oneprocessor to: obtain a transmission parameter set of the PBCH, whereinthe transmission parameter set comprises carrier frequency resource usedfor transmitting the PBCH and information in the PBCH; and determine aframe structure used between the network device and the communicationapparatus according to relationship between the transmission parameterset of the PBCH and the frame structure; and a transmitter, thetransmitter configured to communicate with the network device accordingto the frame structure.
 11. The apparatus according to claim 10, whereinthe information in the PBCH comprises: information carried in the PBCH;a field carried in the PBCH; or an information element carried in thePBCH.
 12. A communication apparatus, comprising: at least one processor;one or more memories coupled to the at least one processor and storingprogramming instructions for execution by the at least one processor to:determine a communications air interface technology to be used betweenthe apparatus and a terminal device, wherein different communicationsair interface technologies correspond to different frame structures; anddetermine a transmission parameter set of a physical broadcast channel(PBCH) according to relationship between the transmission parameter setof the PBCH and a frame structure, wherein the transmission parameterset of the PBCH indicates the frame structure to be used between theapparatus and the terminal device; and a transmitter, the transmitterconfigured to: transmit the PBCH to the terminal device; and communicatewith the terminal device by using the frame structure corresponding tothe communications air interface technology.
 13. The apparatus accordingto claim 12, wherein the transmission parameter set comprises carrierfrequency resource used for transmitting the PBCH and information in thePBCH.
 14. The apparatus according to claim 13, wherein the informationin the PBCH comprises: information carried in the PBCH; a field carriedin the PBCH; or an information element carried in the PBCH.